Smallest IO window size for PCI bridges is 0x1000. Fix default size
accordingly. Avoids broken resource assignments like this:
[ ... ]
PciBus: Resource Map for Root Bridge PciRoot(0x0)
Type = Io16; Base = 0x6000; Length = 0x7000; Alignment = 0xFFF
[ ... ]
Base = 0xC000; Length = 0x200; Alignment = 0xFFF; Owner = PPB
[00|02|00:**]
Base = 0xC200; Length = 0x40; Alignment = 0x3F; Owner = PCI
[00|1F|03:20]
Base = 0xC240; Length = 0x20; Alignment = 0x1F; Owner = PCI
[00|1F|02:20]
[ ... ]
... which the linux kernel fixes up later:
[ 0.644657] pci 0000:00:1f.3: BAR 4: assigned [io 0x1000-0x103f]
[ 0.646833] pci 0000:00:1f.2: BAR 4: assigned [io 0x1040-0x105f]
With the patch applied:
{ ... ]
PciBus: Resource Map for Root Bridge PciRoot(0x0)
Type = Io16; Base = 0x6000; Length = 0x8000; Alignment = 0xFFF
[ ... ]
Base = 0xC000; Length = 0x1000; Alignment = 0xFFF;
Owner = PPB [00|02|00:**]
Base = 0xD000; Length = 0x40; Alignment = 0x3F; Owner = PCI
[00|1F|03:20]
Base = 0xD040; Length = 0x20; Alignment = 0x1F; Owner = PCI
[00|1F|02:20]
[ ... ]
Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c
b/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c
index 69903a600981..bb2389d16c70 100644
--- a/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c
+++ b/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c
@@ -741,7 +741,7 @@ GetResourcePadding (
//
// Request defaults.
//
- SetIoPadding (--FirstResource, (UINTN)HighBitSetRoundUp64 (512));
+ SetIoPadding (--FirstResource, (UINTN)HighBitSetRoundUp64 (0x1000));
}
if (DefaultMmio) {
--
2.41.0
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